Dishonest soldiers right ahead in court (7)
I believe the answer is:
corrupt
'dishonest' is the definition.
(similar in meaning)
'soldiers right ahead in court' is the wordplay.
'soldiers' becomes 'OR' (Other Ranks).
'right' becomes 'r' (common abbreviation).
'ahead' becomes 'up' (similar in meaning).
'in' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'or'+'r'+'up'='orrup'
'orrup' placed into 'ct' is 'CORRUPT'.
(Other definitions for corrupt that I've seen before include "Bent" , "Not straight, dishonest" , "spoilt" , "Willing to act dishonestly in return for personal gain" , "base" .)